This one gave me fits until I finally did enough source-diving to sort out what was causing it. If you try to create gates using <Lookup table="StargateInbound"/> and <Lookup table="StargateOutbound"/> instead of <Lookup table="HumanSpaceStargates"/>, but your stargates for the system as defined in the topology aren’t named “Inbound” and “Outbound”, the game announces that it has had enough of your shenanigans by giving you a black screen with the following: